/*
 * Copyright (C) 2019 Adaptech s.r.o., Robert Pösel
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.googlecode.leptonica.android;

import androidx.annotation.IntRange;

/**
 * @author alanv@google.com (Alan Viverette)
 */
@SuppressWarnings("WeakerAccess")
public class Rotate {
	static {
		System.loadLibrary("jpeg");
		System.loadLibrary("pngx");
		System.loadLibrary("leptonica");
	}

	// Rotation default

	/**
	 * Default rotation quality is high.
	 */
	public static final boolean ROTATE_QUALITY = true;

	/**
	 * Performs rotation using the default parameters.
	 *
	 * @param pixs    The source pix.
	 * @param degrees The number of degrees to rotate; clockwise is positive.
	 * @return the rotated source image
	 */
	public static Pix rotate(Pix pixs, float degrees) {
		return rotate(pixs, degrees, false);
	}

	/**
	 * Performs rotation with resizing using the default parameters.
	 *
	 * @param pixs    The source pix.
	 * @param degrees The number of degrees to rotate; clockwise is positive.
	 * @param quality Whether to use high-quality rotation.
	 * @return the rotated source image
	 */
	public static Pix rotate(Pix pixs, float degrees, boolean quality) {
		return rotate(pixs, degrees, quality, true);
	}

	/**
	 * Performs basic image rotation about the center.
	 * <p>
	 * Notes:
	 * <ol>
	 * <li>Rotation is about the center of the image.
	 * <li>For very small rotations, just return a clone.
	 * <li>Rotation brings either white or black pixels in from outside the
	 * image.
	 * <li>Above 20 degrees, if rotation by shear is requested, we rotate by
	 * sampling.
	 * <li>Colormaps are removed for rotation by area map and shear.
	 * <li>The dest can be expanded so that no image pixels are lost. To invoke
	 * expansion, input the original width and height. For repeated rotation,
	 * use of the original width and height allows the expansion to stop at the
	 * maximum required size, which is a square with side = sqrt(w*w + h*h).
	 * </ol>
	 *
	 * @param pixs    The source pix.
	 * @param degrees The number of degrees to rotate; clockwise is positive.
	 * @param quality Whether to use high-quality rotation.
	 * @param resize  Whether to expand the output so that no pixels are lost.
	 *                <strong>Note:</strong> 1bpp images are always resized when
	 *                quality is {@code true}.
	 * @return the rotated source image
	 */
	public static Pix rotate(Pix pixs, float degrees, boolean quality, boolean resize) {
		if (pixs == null)
			throw new IllegalArgumentException("Source pix must be non-null");

		long nativePix = nativeRotate(pixs.getNativePix(), degrees, quality,
				resize);

		if (nativePix == 0)
			return null;

		return new Pix(nativePix);
	}

	/**
	 * Performs top-level rotation by multiples of 90 degrees.
	 *
	 * @param pixs  The source pix (all depths)
	 * @param quads 0-3; number of 90 degree cw rotations
	 * @return the rotated source image
	 */
	public static Pix rotateOrth(Pix pixs, @IntRange(from = 0, to = 3) int quads) {
		if (pixs == null)
			throw new IllegalArgumentException("Source pix must be non-null");
		if (quads < 0 || quads > 3)
			throw new IllegalArgumentException("quads not in {0,1,2,3}");

		long nativePix = nativeRotateOrth(pixs.getNativePix(), quads);

		if (nativePix == 0)
			return null;

		return new Pix(nativePix);
	}

	// ***************
	// * NATIVE CODE *
	// ***************

	private static native long nativeRotateOrth(long nativePix, int quads);

	private static native long nativeRotate(long nativePix, float degrees, boolean quality,
											boolean resize);
}
